Second, concreteness: you can specifically talk about what he can't insist on doing?
Third, discuss the causes of the problem, and make a concrete analysis:
Children may not insist on what they don't like, but they do it because their parents or teachers ask them to.
Solution: Understand children, and it is difficult for adults to stick to things they don't like. Try to help children find fun in what they have to do. Try to give children the opportunity to choose, and it is easier to stick to what they choose.
B can communicate with children and let them tell the reason why they can't insist. Parents try to use heuristic questions in communication, and don't criticize or blame their children for any reason. Listen first and try to make the children talk as much as possible. After finding the reason, discuss the solution to the problem with your child.
C for things that children can't insist on, parents can seriously talk to their children and tell them their true feelings. For example, when mom heard you say that you don't want to go to the Chinese studies class again, she was very anxious, because I think it's very important for a person to have perseverance, otherwise nothing will happen. So, mom wants to talk to you, see why you don't want to go and see if mom can help you.